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I think you might be ok. Most fish will tolerate (and sometimes thrive) in imperfect water hardness/pH if they are acclimated slowly and carefully.

If you were worried you could get some RO water from a store and use it in combination with your tap water (dechlorinated) over a few weeks until you wean them onto just your tap source water. One of my stores sells RO water in very large plastic kegs that you can bring back for re-filling at a discount. I have no idea how expensive it is though.

all fish you are looking at are generally farm bred nowadays and are adaptable, even though their great great great great great great grandfathers and grandmothers may have come from some soft water stream in south america or africa.
unless you want to breed them your fish should be completely fine.